Correlated- k -based method for fast generation of bandpass radiance and transmittance look-up-tables

Acharya, Prabhat K.; Berk, Alexander; Panfili, R.; Adler‐Golden, Steven M.; Wetmore, Alan; Shirkey, Richard C.

doi:10.1117/12.720842

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“…Note that MODTRAN had to be modified to output the kdb. More on the kdb and ckdb, including their generation, use and dependence on atmospheric pressure and temperature is described in the earlier SPIE papers 5,6 . There we also describe how blackbody, aerosol.…”

Section: Methodology Of Kurt-msmentioning

confidence: 99%

“…Thus there is a need to reduce the number of c-k terms in each layer transmittance. We have implemented a convolution-resampling (C-R) scheme to reduce the number of c-k terms for this purpose as described in references 5,6 . The method, shown in Fig.…”

Section: Methodology Of Kurt-msmentioning

confidence: 99%

“…In addition, kURT automatically accounts for the sensor bandpass response function, thus eliminating post-processing of higher-resolution spectral information. The second SPIE paper 6 described expanding kURT ideas into computing multiple-scattered radiance by using DISORT within the kURT framework, dubbed kURT-MS. This paper serves as an update on both the previous two.…”

Section: Introductionmentioning

confidence: 99%

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Correlated- k based fast accurate bandpass radiance and transmittance calculations for hyperspectral and multispectral scenes

et al. 2007

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The ability to rapidly calculate at-sensor radiance over a large number of lines of sight (LOSs) is critical for hyperspectral and multispectral scene simulations and look-up table generation, both of which are increasingly used for sensor design, performance evaluation, data analysis, and software and systems evaluations. We have demonstrated a new radiation transport (RT) capability that combines an efficient multiple-LOS (MLOS) multiple scattering (MS) algorithm with a broad-bandpass correlated-k methodology called kURT-MS, where kURT stands for correlated-k-based Ultra-fast Radiative Transfer. The MLOS capability is based on DISORT and exploits the existing MODTRAN-DISORT interface. kURT-MS is a new sensor-specific fast radiative transfer formalism for UV-visible to LWIR wavelengths that is derived from MODTRAN's correlated-k parameters. Scattering parameters, blackbody and solar functions are cast as a few sensor-specific and bandpass-specific k-dependent source terms for radiance computations. Preliminary transmittance results are within 2% of MODTRAN with a two-orders-of-magnitude computational savings. Preliminary radiance computations in the visible spectrum are within a few percent of MODTRAN results, but with orders of magnitude speed up over comparable MODTRAN runs. This new RT capability (embodied in two software packages: kURT-MS and MODTRAN-kURT) has potential applications for remote sensing applications such as hyperspectral scene simulation and look-up table generation for atmospheric compensation analysis as well as target acquisition algorithms for near earth scenarios.

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Section: Methodology Of Kurt-msmentioning

confidence: 99%

Section: Methodology Of Kurt-msmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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